<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="app">
        <h1>{{msg}}</h1>
        <BUtton @click="flip">逆转世界</BUtton>

    </div>
    <script src="../../v2_base_classes/vue.js"></script>
    <script>
        const app=new Vue({
            el:"#app",
            data:{
                msg:"Hello,World"
            },
            methods:{
               flip(){
                    this.msg=this.msg.split("").reverse().join("")
                }
            }
        })
    </script>
</body>
</html>